railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Hydrocarbons

ଇଥେନର ମୋଲାର ବସ୍ତୁତ୍ଵ ( C2H2 ) ହେଉଛି 

1
25u
2
28u
3
30u
4
26u
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